Muffler



J. J. COMPO Sept. 13, 1932.

MUFFLER Filed Dec. 21. 1929 gwuentoo Patented Sept. 13, 1932 UNITEDSTATES PATENT OFFICE JOHN J. COMPO, 0F DEFIANCE, OHIO MUFFLERApplication filed December 21, 1929. Serial No. 415,655.

' mufller are reduced to a substantially constant current or flow of thegases at the outlet of the muffler.

The invention may be contained in muf flers that vary in their detailsof construc- ,7 tion and, to illustrate a practical application U of theinvention, I have selected a mufiler containing the invention, and shalldescribe it hereinafter. The particular structure selected is shown inthe accompanying drawing.

Fig. 1 is a longitudinal section of the particular mufiler selected forpurposes of illustration. Fig. 2 is a view of a section taken on theplane of the line 2-2 indicated in Fig. 1. Fig. 3 is a view of a sectiontaken on the plane of the line 33 indicated in Fig. 1. Fig. 4 is a Viewof a section taken on the plane of the line 44 indicated in Fig. 1. Fig.5 is a view of a longitudinal section of the connector for connectingone of the ports of the muffler with exhaust pipes of different sizes.

The mufller illustrated in the drawing comprises a drum, or shell, 1cylindrical in form,

"4 and a core 2 formed of a pair of interconflanges 8 that fit theinterior of the shell 1. The discs are secured 'tothe cones 3 and 4. Thesmall ends of the cones extend through the discs 5 and 7 which form theinlet and the outlet of the muflier. The ends of the cones are slottedon opposite sides, as at 10, and a split clamping ring 11 surrounds theslotted portions of the smaller ends of the cones whereby the mufilermay be connected in the exhaust pipe of the engine. The pipe may beinserted within theends of the cone, and the rings 11 may be secured inposition to clamp the protruding ends of the cones about portions of theexhaustpipe. If the pipe is smaller than the inlet and outlet formed bythe protruding ends of the cones, a connector 12 which have portions ofreduced cross-sectional area are inserted within the ends of the cones,and the clamping rings 11 are clamped about portions of the connector 12having the larger diameter, and the exhaust pipe may be inserted withinthe protruding portion of the connector. The connectors 12 are alsoprovided with slots 13 located on opposite sides and so that when theexhaust pipe is inserted in position in the connector 12 the protrudingportion of the connector may, in each case, be clamped about the exhaustpipe by means of the split clamping ring 14 which is located around theprotruding portion of the connector 12. Thus, a tight connection may bemade to the portion of the exhaust pipe located intermediate the mufilerand the engine and the portion of the exhaust pipe that forms thedelivery pipe of the exhaust products from the muffler.

The discs 5 and 7 surround and are welded to the smaller ends of thecones, while the disc 6 is provided with a raised central portion 18,which forms interior and exterior cylindrical surfaces 19 into whichandover which the larger ends of the cones 4 and 3, respectively, fit.This affords an exceedingly convenient means for connecting the parts ofthe core. Preferably, the cones are welded to the disc 6 along thesurfaces that contact. with the substantially cylindrical surfaces ofthe disc 6.

A central cylindrical sheet metal pipe 22 fits the interior of thesmaller end of the cone 3 and terminates at the disc 6. The disc 6 formsa closed wall within the cone 3. The pipe 22 is provided with aplurality of openings 23 in the vicinity of the disc 6 which opens intothe interior of the cone 3 at the larger end of the cone and forms anexpansion chamber for the expansion of the gases. The remainder of thepipe 22 is non-perforated, so that the gases are directed rto'the largerchamber formed by the larger end of the cone 3. Near the smaller end ofthe cone 3, the cone is provided with a plurality of openings 24. Thus,the gases pass to the portion of the cone having a reducedcrosssectional area and through the openings 24 into the larger chamber25, formed between the smaller end of the cone 3 and the shell 1, whichagain forms an expansion chamber, the gases previously having passedthrough a passageway having a reduced cross-sectional area. The gasesthen pass through the opening 26 formed exterior to the cone 3 and inthe disc 6. The outward flow of the gasesis towards the end ofthe shellthat surrounds the smaller end of the cone 4 and the gases expand andrecoil from the disc 7. Intermediate the reduced pulsatory movements ofthe gas through the openings 26, it passes through the openings 27 fromthe reduced cross-sectional area of the chamber 28 into the larger endof the cone 29. The gases then pass through the smaller end of the coneto the outlet formed by the smaller end of the cone 4 that protrudesfrom the disc 7 and the shell 1.

In order to prevent rotation of the gases through the outlet, thesmaller end of the core 2 is provided with partitions 32 that extendacross the cone and, in the particular construction shown, divide thecone from substantially the midpoint of its axis to the outer end of thecone, into four chambers 33, which reduces all rotation of the gases,and enables a steady outward flow of the gases from the interior of thecone 4.

The core 2 comprising the cones 3 and 4 and the discs 5, 6, and 7, andthe parts located within the cones, are first assembled, the cones beingconnected together by the disc 6. The flanges 8 of the discs 5, 6, and 7being formed to fit the interior of the cylinder 1, the core may beassembled and then pushed into the cylinder 1. This forms an exceedinglyconvenient means of forming the mufiler and reduces the cost ofmanufacture.

I claim:

1. In a mufiler, a cylindrical drum, a core comprising a pair of conesand'three discs,

two of the discs surrounding the smaller ends of the cones and the thirddisc located at the larger ends of the cones, the said discs fitting theinterior of the drum, a cylindrical tubular member located within one ofthe cones and extending to the central disc of the muf fier and havingopenings in the vicinity of the central disc, the last named cone havingopenings near the inlet of the mufiler, the central disc having openingsexterior to the said cones, the other of the cones having openings nearthe central disc, the smaller end of the last named cone forming theoutlet of the inuflier.

2. In a muflier, a cylindrical drum, a core comprising a pair of conesand three discs, two of the discs surrounding the smaller ends of thecones and the third disc located at the larger ends of the cones, thesaid discs fitting the interior of the drum, a cylindrical tubularmember located within one of the cones and extending to the central discof the muffler and having openings in the vicinity of the central disc,the last named cone having openings near the inlet of the mufller, thecentral disc having openings exterior to the said cones, the other ofthe cones having openings near the central disc, the last named conehaving radially extending partitioning walls extending from the axis ofthe cone to the inner surface of the cone for dividing the interior ofthe cone into sector shaped compartments, the smaller end of the lastnamed cone forming the outlet of the mufller.

In witness whereof I have hereunto signed my name to this specification.

JOHN J. COMPO.

